4.(25pt) For the circuit shown in Figure 4, the parameters are: = 0.1 kΩ, R1 = 40 kΩ, R2 = 5.72 kΩ, RE = 0.5 kΩ, Rc = 5 kΩ, and RL = 10 kΩ. The transistor parameters are: β = 150, 0.7 V, neglect Early effect, Cπ = 35 pF, Cμ = 4 pF, Cc= 1 μF. Thermal voltage VT = 26 mV. Please determine the lower and upper corner frequency (fL and fH), midband gain. (10pt, 10pt, 5pt)

2.(30pt) For the circuit shown in Figure 2, the transistor parameters of Q1 and Q2 are: = 1.2 V, = 1.6 mA/V2, and neglect channel length modulation effect. Let R1 + R2 + R3 = 300 kΩ and Rs = 10 kΩ. = 5 V, -Vs =-5 V. (a) Please determine the R1, R2, R3 and RD such that DC current ID = 0.4 mA and DC voltage Coupling capacitor Cc is large enough that can be treated as short circuit for AC analysis. Please also find the voltage gain of small signal. (5pt*6)

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